Hot-air furnace.



110.742.062.' 's PAugBNTED 0011.20; 190s.

n P. J. P10011. f

HOT AIR PURNAGE. APPLI'oATloN H'LBD APR. i1, 190s.

No MODEL. f SHEETS-SHEET i. 4

PTLNIED 00127240-, `1903. F. J. PIOGILV I' HOT AIR PURNACE,v APPLIUATIONFILED un. 11, A1903.

2 SHEETS-SHEET 2.

- N0 MODEL.

TTOH/VE 73.'

YH: No'njus PETERS co, PHoToumn..wAsM|NuTou, nA c.

l Patented October-20, 1903.

PATENT OFFICE. l

FRANK J. PIO-CH, OF CRESTON, IOWA.

HOT-AIR Fuels/lola.v

SPECIFICATION forming part'of Letters Patent N o. 742,062, dated October20, 1903.

Application iiled April 11, 19037.

To all whom t may concern,.-

Beit known that I, FRANK J. PIOCH, a citizen of the United States, and aresident of Creston, in the county of Union and State of Iowa, haveinvented a new and Improved Hot- Air Furnace, of which the following isa full, clear, and exact description. l

My invention relates to hot-air furnaces and to analogous heatingappliances, my more particular object being to increase the efficiencyand controllability of the draft and to produce certain improvements inconstruction.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure 1 is a central vertical section on the line 1 1 in Fig. 2 of ahot-air furnace embodying my invention. Fig. 2 is a horizontal sectionupon the line 2 2 in Fig. 1 looking in the direction of the arrow. Fig.3 is a fragmentary section upon the line 3 3 in Fig. 2 looking in thedirection of the arrow. Fig. 4 is a side elevation of the arm used forcontrolling a portion of the draft by the opening and closing of thefurnace-doors. Fig. 4 is a rear elevation of the closure-lid and itsimmediate connection, and Fig. 5 isa section on the line made insections 1l 12, provided with radial lugs 13 14, the section 12 beingprovided at its top with an annular liange 15, into which fits thebottom of the fire-dome 16. The top of this dome is rounded at 16a intothe form of a cupola. A square passage 17 is provided for the purpose offeeding fuel into the lirepot in the usual manner. A plurality oftubular elbows 18 are integrally connected with the fire-dome and are ofthe shape indicated best in Figs. land 3. Mounted upon several of theseelbows are tubes 19, spaced apart, as indicated in Fig. 2. At 20 is aconical mem- `downward and into the smokepipe.

Serial No. 152,157. (No model.)

ber constructedl of metal and closed at its top, as indicated in Fig.1.Y This member rests at 2Oa upon one of the elbows 18.

21 is a hollow member, partially flattened at its bottom, as indicatedin Fig. 5, and connected by a joint 22 with the'square passage 17. Thetop of the tubular member 21 is provided with an appropriate joint 21j,to be connected with a pipe 25. The several tubes 19 are similarlyprovided'with joints23, whereby they maybeconnected with the severaltops of the elbows 18. A number of curved tubular passages 25 areconnected with the respective topsof the tubes 19 and the tubularmember'2l. These tubular passages 25 terminate at 26 within.the`cylinder 27, being thereby caused to converge to a common point abovethe fire-dome, and a small pipe 28 leads oit laterally from this pointof convergence.

. Arocking damper 29 is pivoted at 30 and is provided with a lug 31,which is engaged by a rod 32, provided with lugs 33 and with a handle34, whereby the damper 29 may be adjusted to any desired degree bymerelylifting the handle 34 andmoving the same in or out, as desired. Arod 35, provided with a handle 36, is connected with a rocking damper37, this damper being disposed immediately adjacent to the central orcupola outlet 38 of the fire-dome.

A pipe 39 is connected at 40 to the cylinder 27 and is of the sinuousshape indicated in Fig. 1. This pipe normally carries the smoke andgases of combustion directly upward then laterally in a direction to theright and thnce onnected 'to the. end of sinuous pipe 39, by means of ajoint 41, is a smoke-box or checkdraft 42, provided with a closure-lid43, this lid being provided with slot-s 44 45 for the rods 35 32,enabling the same to be manipulated without opening the closuredd 43.This lid is pivoted at`46 upon the smoke-box or checkdraft 42 near thelower end of the smoke-pipe 47, the smoke-pipebeing mounted, by means ofa joint 48, upon the smoke-box42. 4

The furnace-door proper is shown at 49 and is pivoted at 50, so as to befree to swing in` the usual manner. Mounted rigidly upon this door andmovable therewith is an arm 51, provided at its free end with anadjustable bearer 52, the same being radially mov- IOC able and securedin position by an adjustable bolt 53. The door 49 is provided with a handie 5l and with the usual draft accessory 54, this draft accessory beingmounted upon the central pivot 55 inthe usual manner. The square passage17 is provided with an aper-` ture 5G, opening into the tubular member2l, and a small innerdoor 57 is hinged at 58 and is free to partiallyobstruct the passage 56. The closing of the door forces the bearer 52into engagement with the inner door 57,caus ing the same to occupy theposition indicated in Fig. l, and thereby to partially obstruct thedraft otherwise passing up into the tubular member 2l. When, however,the door 49 is open, the inner door 57 swings downwardly and into itsvertical position. The object of this movement is to prevent a suddengust of flame and hot gases from passing out of the furnace-door uponthe same being opened. The idea is that the opening of the furnacedoorcauses the inner door57 to open abruptly,

thereby starting up a vigorous draft through the passage 56 and tubularmember 2l, thus averting the iame, which might otherwise flash out ofthe furnace-door.

The general draft of the furnace may be regulated for four differentpurposes and for all of these purposes may be controlled bymeansofthehandles3436. Byrunningthese handles out through the smoke-box42, as above described, the necessity to open any part of the furnace isobviated. The rods 32 35 lie directly in the path of the smoke and hotgases, so that there is no need for any other passages through thecasting,which might allow some of the gases to escape.

In order to start the fire, I generally open both of the dampers 37 and29. This gives the tire a free escape to the chimney and prometes thegreatest draft possible. After the tire begins to burn briskly I closethe damper 29, leaving the damper 37 open. This causes the llames andhot gases to travel upward through the central or cupola passage 38 andto pass up into the pipe 39, to thence pass in a lateral directiondownward to the smoke-box 42 and thence pass upward into the smoke-pipe.The sinuous path thus pursued enables the stove to throw out more heatthan when both dampers are open, as at first described. Suppose now thaton account of bad weather 0r of a bad draft in the chimney the fireburns with diculty. The proper way to remedy this is to close the damper37 and open the damper 29. The flames then travel upward through thedome 1G into the cupola lwhence they spread outwardly and downwardly,passing into the elbows 1S and up through the tubes 19 and 2l, thencethrough the tubular members 25 to a common point immediately above thedamper 37, thence through the pipe 28 to the smoke-box and to thesmoke-pipe. A smaller portion will in this case pass through the pipe39, or nearly all of the llames and hot gases will pass through theshort pipe 2S. By this arrangement the flames and hot gases haveconsiderable travel and will keep the furnace well heated. The fourthand last way, and which is preferable under normal conditions, is toclose both dampers. The ames and hot gases then pursue the paths ofmaximum length, passing first up into the cupola 16, thence outwardlyand downwardly into the elbows 18, thence upwardly through the severaltubular passages and downwardly into the cylinder 27, thence upwardlyinto the pipe 39 and through a sinuous path to the smoke-box 42, whencethey make their escape into the smoke-pipe. This gives the furnacemaximum heating capacity.

It will be observed that the short pipe 2S and the long and sinuous pipe39 virtually constitute a bifurcated offtake for the flames and gases ofcombustion.

Having thus described my invention, I claim as new and desire to secureby Letters Patentl. In a hot-airfurnace, the combination of a fire-dome,a plurality of tubular passages connected therewith and converging to acommon point, an oiltake connected with said passages, said olftakehaving two members, and means controllable at will for obstructing oneof said members.

2. In a hot-air furnace, the combination of a fire-dome, a plurality oftubular passages connected therewith and converging to a common point,an offtake connected with said passages, said offtake having twomembers, and a manually-controlled damper connected with one of saidmembers.

3. In a hot-air furnace, the combination of a fire-dome, provided withan outlet, a damper connected with said outlet, a plurality of tubularpassages connected with said firedome and converging to a common point,above said outlet, an offtake connected with said tubular passages, saidofftake having two tubular members, and a manually-controlled dampermounted within one of said passages.

4. In a hot-air furnace, the combination of a fire-dome, mechanismconnected therewith for directing the flames and hot gases to a pointdisposed above said dome, a bifurcated otftake for directing said llamesand hot gases to a chimney, said oiftake having two members, one beingstraight and the other comparatively sinuous, and means controllable atwill for governing the capacity of said straight member.

In testimony whereof I have signed my name to this specification in thepresence oil' two subscribing witnesses.

FRANK J. PIOCII. Vtitnesses:

HELEN D. MITCHELL, HEZEKIAH MITCHELL.

IOO

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